Răspuns :
1) a*(b+c)= ab+ac = -2/5 + 1/3 aducem la acelasi numitor
(-6 +5)/15= -1/15
20 a(b-c)= ab-ac= -2/5 -1/3 aducem la acelasi numitor
(-6-5)/15= -11/15
(-6 +5)/15= -1/15
20 a(b-c)= ab-ac= -2/5 -1/3 aducem la acelasi numitor
(-6-5)/15= -11/15
1) a*(b+c) = a*b + a*c = [tex] ^{3)} [/tex] (-2/5) + [tex]^{5)} [/tex] (1/3)
= -6/15 + 5/15
= -1/15
2) a*(b-c) = a*b - a*c = [tex]^{3)} [/tex] (-2/5) - [tex]^{5)} [/tex] (1/3)
= -6/15 - 5/15
= -11/15
= -6/15 + 5/15
= -1/15
2) a*(b-c) = a*b - a*c = [tex]^{3)} [/tex] (-2/5) - [tex]^{5)} [/tex] (1/3)
= -6/15 - 5/15
= -11/15